NO.1 SECURITY LIGHT DISPLAY IS NOT NORMAL [IMMOBILIZER SYSTEM]


id0903f5800200

1
The security light display is not normal.
DESCRIPTION
•  The security light remains illuminated 2 min or more after the engine switch is turned to the ON position
•  The security light does not illuminate when the engine switch is turned to the ON position.
•  The security light remains illuminated while the engine switch is at the LOCK position.
•  The security light does not flash or the flashing interval is abnormal while the engine switch is at the LOCK position.
POSSIBLE CAUSE
•  Keyless unit malfunction
•  Instrument cluster malfunction
•  Open or short circuit in the wiring harness between the instrument cluster and immobilizer unit
Note
•  If the security light remains illuminated for approx. 1 min after the engine switch is turned to the ON position and then displays a DTC, perform immobilizer system malfunction diagnosis according to that DTC. (See DTC TABLE [IMMOBILIZER SYSTEM].)
•  While performing immobilizer system security access using the M-MDS, the security light does not illuminate even if the engine switch is turned to the ON position. Verify the illumination condition of the security light by disconnecting the DLC-2 to release security access.

Note
•  Normal operation of the security light is as follows. The light starts flashing every 2 s when the engine switch is turned from ON to ACC position and the immobilizer system is armed. The light stops flashing when the engine switch is turned to the ON position with the correct ignition key. At this time, the immobilizer system is disarmed and the security light illuminates for about 3 s and then goes out.

Diagnostic Procedure

STEP

INSPECTION

ACTION

1
•  Turn the engine switch to the ON position.
•  Do other warning lights in the instrument cluster illuminate normally?
Yes
Go to the next step.
No
Inspect the instrument cluster.
2
•  Turn the engine switch to the LOCK position.
•  Disconnect the negative battery cable.
•  Disconnect the instrument cluster connector (24-pin).
•  Connect the negative battery cable.
•  Does the security light illuminate?
Yes
Replace the instrument cluster.
No
Go to the next step.
3
•  Disconnect the negative battery cable.
•  Connect the instrument cluster connector.
•  Disconnect the immobilizer unit connector
•  Connect the negative battery cable.
•  Does the security light illuminate?
Yes
Go to the next step.
No
Repair or replace the wiring harness for short to GND between the immobilizer unit connector terminal M and the instrument cluster terminal 1J.
4
•  Disconnect the negative battery cable.
•  Ground instrument cluster terminal 1J using a jumper wire.
•  Connect the negative battery cable.
•  Does the security light illuminate?
Yes
Go to the next step.
No
Replace the instrument cluster.
5
•  Disconnect the negative battery cable.
•  Connect the instrument cluster connector.
•  Disconnect the immobilizer unit connector
•  Ground immobilizer unit connector terminal M using a jumper wire.
•  Connect the negative battery cable.
•  Does the security light illuminate?
Yes
Replace the immobilizer unit.
No
Repair or replace the wiring harness for short to GND between the immobilizer unit connector terminal M and the instrument cluster terminal 1J.